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Vliv skladování násadových vajec na parametry užitkovosti brojlerových kuřat
Skoupá, Markéta
This thesis deals with the effect of eighteen-day storage of hatching eggs of broiler chickens on the quality of day-old chicks and their performance parameters. The experiment was performed on 562 Ross 308 hybrid chickens from hatch to day 35 of age. Control group chicks were hatched from eggs set in to incubator after four days of lay, while the test group eggs were stored for 18 days prior to incubation. There was no statistically significant (P˃0,05) difference between the groups in the average day-old chicks weight. However, at days 10, 17, 24, 31, and 35, the average weight of experimental group was statistically significant (P˂0,05) below the weight of the control group. The chickens of the experimental group showed statistically significant (P˂0,05) higher trypsin activity (2703,15 U/ml) compared to the control group chickens (2125,60 U/ml). The difference in the average weight of the pancreas or pancreas in proportion of live weight between the groups was not statistically significant. There was no difference in the mean villus length between the groups studied. However, the mean depth of intestinal crypts was statistically significantly (P˂0.05) higher (106,78 µm) in the control group than in the experimental group (89,64 µm). A statistically significant (P˂0,05) difference was also found in the ratio between villi length and crypt depth, where the ratio was 5,07 in the experimental group, while in the control group it was lower (4,60). Long-term storage of hatching eggs has had a negative impact on the growth of broiler chickens.
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